I was asked to make a celebration of life cake for a friend's mother who recently passed away. She loved carnations, blue. I sculpted the cae into a clay pot and lightly iced with BC. Covered it with terra cotta color fondant after I had froze the cake. The fondant immediately started to sweat. I completed the cake with oreo and fudge topping as the dirt. I constructed carnations, blue-tinged, out of fondant and attached them with leaves into the pot. I could not figure out how to get that fondant from not sweating. Well, I added a fan, not too close, and sure enough it is starting to set. Whew! I thought this would have been the end. I now know to only stick the cake in the freezer for 5-10 minutes before sculpting and then leave it at room temperature before covering in fondant.
Sorry you had issues! The cake looks very nice. Sometimes the best lessons are learned through trial and error!
Glad that the fan helped. It is ok to freeze your cakes - you just have to give them several hours to thaw out.
Or you can stick them in the freezer for 10 minutes and then carve, as you said.